Metal working – Method of mechanical manufacture – Roller making
Patent
1990-12-31
1993-01-12
Eley, Timothy V.
Metal working
Method of mechanical manufacture
Roller making
295251, 492 27, 492 45, B23P 1900, B23P 1904
Patent
active
051778670
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for fitting a roll-ring onto a roll axle, and a roll-ring mount for carrying out the method.
A rod mill comprises roll units in which pairs of rolls are arranged alternately with horizontal and vertical axle directions. The rolls in each of the roll pairs have the form of replaceable roll rings mounted on the free ends of rotationally-driven roll axles.
The roll rings are normally made of cemented carbide material or hardmetal, which due to its limited tensile strength tends to crack when subjected to excessively high tensile loads. In order to avoid the formation of cracks, the roll rings are normally clamped on the roll axles between a shoulder provided on said axle and a clamping plate, with a clamping force such that the frictional forces acting between the sides of the roll-ring and the abutment surfaces of the clamping plate and the shoulder on the roll-axle respectively are sufficiently great to ensure that the roll-ring will be rotated positively by the roll axle.
A known roll-ring fitting tool or mount will now be described with reference to FIG. 1.
The end of the roll-axle 1 illustrated in FIG. 1 has a conical surface 2 and an inner shoulder 3. The illustrated roll-ring 4 is fitted to the axle in the following manner. A centering ring 4' is fitted into the ring-opening of the roll-ring 4. The roll-ring assembly 4, 4' is then fitted onto the conical surface 2 of the roll axle, so that the roll-ring is in abutment with the shoulder 3. A press-ring 5, followed by a cup spring 6 and an internally screw-threaded ring 7 is then fitted onto the roll-axle and the ring 7 screwed onto a screw-threaded part 8 thereof. A press tool 9 is then screwed onto the outer screw-thread 10 of the roll-axle. Pressure fluid is now supplied to the press tool, through a nozzle 11, whereupon the edge of the press tool will exert an axial pressure on the periphery of the cup spring 6, so as to apply a controlled axial pressure-force on the roll-ring 4, which is consequently clamped between the shoulder 3 and the press ring 5. Subsequent to this application of pressure, the ring 7 is screwed into abutment with the cup spring 6, with the aid of a tool 12. The press tool 14 can then be relieved of pressure and removed.
The roll-ring 4 is removed from the roll-axle in the reverse order. The assembly comprising the roll-ring 4 20 and the centering ring 4', however, will remain clamped against the conical surface 2 of the roll-axle even when the pressure exerted by the cup spring 6 has been removed, and it is therefore necessary to supply pressure fluid to a nozzle 13 on the roll axle, in order to loosen the roll-ring assembly.
It will be observed that the components of the roll-ring mount illustrated in FIG. 1 must be manufactured with relatively high precision, since it is necessary for the roll-ring to fit accurately on the roll axle, so as to be able to achieve the high roll-pressure necessary in a roll pair.
A further roll-ring mount based on similar principles is known from SE Patent Specification 7703169-8. The mount taught by this specification also requires the roll-ring to be clamped between a shoulder and a ring with the aid of a spring compressed by means of a hydraulic tool and held in a compressed state by means of a screw-threaded annulus, which is screwed into abutment with the compressed spring.
It will be evident from the above description of the aforesaid roll-ring mount that the mount has a relatively complicated construction and that the work of fitting roll-rings is time consuming, which means long non-productive periods of the rod mill caused by roll-ring changes, since finished products are in modern times manufactured in small series, in order to reduce storage time.
The object of the present invention is to provide a roll-ring fitting method which will reduce the idle time of a rod mill, and also to provide a roll-ring mount for carrying out the method. This object is achieved in accordance with the invention with a method for fitting a roll-ring onto the end of
REFERENCES:
patent: 4813113 (1989-03-01), Wykes et al.
patent: 4881310 (1989-11-01), Wykes et al.
Eley Timothy V.
Morgardshammar AB
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